Intermediate Granite Rocks

Syenite diorite and monzonite.

Intermediate granite rocks.

Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral. Other articles where intermediate rock is discussed. Igneous rocks are classified according to their mineral content. Mafic rocks are dominated by plagioclase and pyroxene even if you can t see them with the naked eye and smaller amounts of olivine.

Composition refers to a rock s chemical and mineral make up. It is usually only exposed at the surface after uplift and erosion have occurred. Intermediate rocks are roughly even mixtures of felsic minerals mainly plagioclase and mafic minerals mainly hornblende pyroxene. It forms from the slow crystallization of magma below earth s surface.

Felsic and mafic rocks. Granodiorite is a plutonic igneous rock formed by intrusion of silica rich magma which cools in batholiths or stocks below the earth s surface. And those with less than 45 percent are ultramafic. Those with between 45 and 55 percent silica are mafic.

For igneous rock the composition is divided into four groups. Ultramafic rocks are dominated by olivine and or pyroxene. And 65 percent silica are intermediate. In igneous petrology an intermediate composition refers to the chemical composition of a rock that has 52 63 wt sio 2 being an intermediate between felsic and mafic compositions.

Compilations of many rock analyses show that rhyolite and granite are felsic with an average silica content of about 72 percent. Felsic intermediate mafic and ultramafic. The name comes from two related rocks to which granodiorite is an intermediate.